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    <title>Restrict Map Movement</title>
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        <h1>Restrict Map Movement</h1>
        <p>Restrict a moveable map to a given rectangular area</p>
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    <p>This example displays a moveable map of <b>Alcatraz Island</b>. Even though the map can still be panned and zoomed, 
      the center of the map cannot be moved outside of the marked area</p>
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    <h3>Code</h3>
    <p>The <code>H.map.ViewModel</code> represents the position of the map. The <code>sync</code> event is fired whenever 
      the rendered map is synchronized with the view-model data. By listening to the sync event the value of the <code>map.center</code> can be restricted to a certain range.</p>
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